8870cd36e7
* go_metrics: adds new runtime metrics go_sched_latency_seconds - Distribution of the time goroutines have spent in the scheduler in a runnable state before actually running go_mutex_wait_total_seconds - Approximate cumulative time goroutines have spent blocked on a sync.Mutex or sync.RWMutex https://github.com/VictoriaMetrics/metrics/issues/54 * fixes data race * add tests * wip * wip --------- Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
117 lines
4.7 KiB
Go
117 lines
4.7 KiB
Go
package metrics
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import (
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"fmt"
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"io"
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"math"
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"runtime"
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runtimemetrics "runtime/metrics"
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"github.com/valyala/histogram"
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)
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// See https://pkg.go.dev/runtime/metrics#hdr-Supported_metrics
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var runtimeMetrics = [][2]string{
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{"/sched/latencies:seconds", "go_sched_latencies_seconds"},
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{"/sync/mutex/wait/total:seconds", "go_mutex_wait_seconds_total"},
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{"/cpu/classes/gc/mark/assist:cpu-seconds", "go_gc_mark_assist_cpu_seconds_total"},
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{"/cpu/classes/gc/total:cpu-seconds", "go_gc_cpu_seconds_total"},
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{"/cpu/classes/scavenge/total:cpu-seconds", "go_scavenge_cpu_seconds_total"},
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{"/gc/gomemlimit:bytes", "go_memlimit_bytes"},
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}
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func writeGoMetrics(w io.Writer) {
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writeRuntimeMetrics(w)
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var ms runtime.MemStats
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runtime.ReadMemStats(&ms)
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fmt.Fprintf(w, "go_memstats_alloc_bytes %d\n", ms.Alloc)
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fmt.Fprintf(w, "go_memstats_alloc_bytes_total %d\n", ms.TotalAlloc)
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fmt.Fprintf(w, "go_memstats_buck_hash_sys_bytes %d\n", ms.BuckHashSys)
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fmt.Fprintf(w, "go_memstats_frees_total %d\n", ms.Frees)
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fmt.Fprintf(w, "go_memstats_gc_cpu_fraction %g\n", ms.GCCPUFraction)
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fmt.Fprintf(w, "go_memstats_gc_sys_bytes %d\n", ms.GCSys)
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fmt.Fprintf(w, "go_memstats_heap_alloc_bytes %d\n", ms.HeapAlloc)
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fmt.Fprintf(w, "go_memstats_heap_idle_bytes %d\n", ms.HeapIdle)
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fmt.Fprintf(w, "go_memstats_heap_inuse_bytes %d\n", ms.HeapInuse)
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fmt.Fprintf(w, "go_memstats_heap_objects %d\n", ms.HeapObjects)
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fmt.Fprintf(w, "go_memstats_heap_released_bytes %d\n", ms.HeapReleased)
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fmt.Fprintf(w, "go_memstats_heap_sys_bytes %d\n", ms.HeapSys)
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fmt.Fprintf(w, "go_memstats_last_gc_time_seconds %g\n", float64(ms.LastGC)/1e9)
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fmt.Fprintf(w, "go_memstats_lookups_total %d\n", ms.Lookups)
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fmt.Fprintf(w, "go_memstats_mallocs_total %d\n", ms.Mallocs)
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fmt.Fprintf(w, "go_memstats_mcache_inuse_bytes %d\n", ms.MCacheInuse)
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fmt.Fprintf(w, "go_memstats_mcache_sys_bytes %d\n", ms.MCacheSys)
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fmt.Fprintf(w, "go_memstats_mspan_inuse_bytes %d\n", ms.MSpanInuse)
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fmt.Fprintf(w, "go_memstats_mspan_sys_bytes %d\n", ms.MSpanSys)
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fmt.Fprintf(w, "go_memstats_next_gc_bytes %d\n", ms.NextGC)
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fmt.Fprintf(w, "go_memstats_other_sys_bytes %d\n", ms.OtherSys)
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fmt.Fprintf(w, "go_memstats_stack_inuse_bytes %d\n", ms.StackInuse)
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fmt.Fprintf(w, "go_memstats_stack_sys_bytes %d\n", ms.StackSys)
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fmt.Fprintf(w, "go_memstats_sys_bytes %d\n", ms.Sys)
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fmt.Fprintf(w, "go_cgo_calls_count %d\n", runtime.NumCgoCall())
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fmt.Fprintf(w, "go_cpu_count %d\n", runtime.NumCPU())
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gcPauses := histogram.NewFast()
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for _, pauseNs := range ms.PauseNs[:] {
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gcPauses.Update(float64(pauseNs) / 1e9)
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}
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phis := []float64{0, 0.25, 0.5, 0.75, 1}
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quantiles := make([]float64, 0, len(phis))
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for i, q := range gcPauses.Quantiles(quantiles[:0], phis) {
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fmt.Fprintf(w, `go_gc_duration_seconds{quantile="%g"} %g`+"\n", phis[i], q)
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}
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fmt.Fprintf(w, `go_gc_duration_seconds_sum %g`+"\n", float64(ms.PauseTotalNs)/1e9)
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fmt.Fprintf(w, `go_gc_duration_seconds_count %d`+"\n", ms.NumGC)
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fmt.Fprintf(w, `go_gc_forced_count %d`+"\n", ms.NumForcedGC)
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fmt.Fprintf(w, `go_gomaxprocs %d`+"\n", runtime.GOMAXPROCS(0))
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fmt.Fprintf(w, `go_goroutines %d`+"\n", runtime.NumGoroutine())
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numThread, _ := runtime.ThreadCreateProfile(nil)
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fmt.Fprintf(w, `go_threads %d`+"\n", numThread)
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// Export build details.
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fmt.Fprintf(w, "go_info{version=%q} 1\n", runtime.Version())
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fmt.Fprintf(w, "go_info_ext{compiler=%q, GOARCH=%q, GOOS=%q, GOROOT=%q} 1\n",
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runtime.Compiler, runtime.GOARCH, runtime.GOOS, runtime.GOROOT())
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}
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func writeRuntimeMetrics(w io.Writer) {
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samples := make([]runtimemetrics.Sample, len(runtimeMetrics))
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for i, rm := range runtimeMetrics {
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samples[i].Name = rm[0]
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}
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runtimemetrics.Read(samples)
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for i, rm := range runtimeMetrics {
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writeRuntimeMetric(w, rm[1], &samples[i])
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}
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}
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func writeRuntimeMetric(w io.Writer, name string, sample *runtimemetrics.Sample) {
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switch sample.Value.Kind() {
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case runtimemetrics.KindBad:
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panic(fmt.Errorf("BUG: unexpected runtimemetrics.KindBad for sample.Name=%q", sample.Name))
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case runtimemetrics.KindUint64:
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fmt.Fprintf(w, "%s %d\n", name, sample.Value.Uint64())
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case runtimemetrics.KindFloat64:
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fmt.Fprintf(w, "%s %g\n", name, sample.Value.Float64())
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case runtimemetrics.KindFloat64Histogram:
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writeRuntimeHistogramMetric(w, name, sample.Value.Float64Histogram())
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}
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}
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func writeRuntimeHistogramMetric(w io.Writer, name string, h *runtimemetrics.Float64Histogram) {
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runningCount := uint64(0)
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buckets := h.Buckets
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for i, count := range h.Counts {
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fmt.Fprintf(w, `%s_bucket{le="%g"} %d`+"\n", name, buckets[i], runningCount)
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runningCount += count
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}
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fmt.Fprintf(w, `%s_bucket{le="%g"} %d`+"\n", name, buckets[len(buckets)-1], runningCount)
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if !math.IsInf(buckets[len(buckets)-1], 1) {
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fmt.Fprintf(w, `%s_bucket{le="+Inf"} %d`+"\n", name, runningCount)
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}
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}
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